输入谋班15个同学c语言的考试成绩,求平均成绩,并对考试成绩从高到底排...答:return *(int *)b - *(int *)a; }int main(){int i,a[15],sum=0;float avg;for(i=0;i<15;i++){scanf("%d",&a[i]);sum+=a[i];}avg=(float)sum/15;qsort(a,15,sizeof(int),cmp);printf("平均数:%.2f\n",avg);for(i=0;i<15;i++)printf("%d ",a[i])...